Kathetron
一种有外栅极的三极管, 辉光放电管
🗣️ 情景例句
Didn't you give them to Richard?
你不是把它们交给Richard了吗？
I'd like to know something about your foreign trade policy.
我非常想了解有关贵国对外贸易的政策。
The aeroplane is flying over the river.
飞机正从河上飞过。